why this way "this.foo = new (function () {..})();" vs. "this.foo = function (){...};"

Question

Is there any difference in the two definitions and assignments of functions?

this.foo = new (function () {..})();

vs.

this.foo = function (){...};

Answer 1

In the first example, it's creating a function and executing it, assigning the result to this.foo. In the second example, it's creating the function and assigning the function itself to this.foo.